Device for air-conditioning control in an air-conditioned room having textile machines

ABSTRACT

The description relates to a device for air conditioning control in an air-conditioned room containing textile machines, especially circular spinning and spooling machines, with an air feed and an air discharge duct connecting the air-conditioned room to the air conditioning unit. A first set of sensors for measuring the temperature and relative humidity of the air in the room is connected for the control purposes to a first regulating circuit, and a second set of sensors for measuring the temperature and relative humidity of the feed air is connected for control purposes to a second regulating circuit. The first and second regulating circuits are connected in cascade, the first regulating circuit supplying a reference value to the second regulating circuit which controls the adjusting components of the air conditioning unit.

This application is a national stage application, according to ChapterII of the Patent Cooperation Treaty. This application claims thepriority date of Nov. 7, 1994, for Swiss Patent Application No. 03312/94-3.

The invention relates to a device for air-conditioning control in anair-conditioned room having textile machines in a textile operation.

In spinning operations, air conditioning systems for controlling thetemperature and the relative humidity in the spinning room, which isequipped with various textile machines, is an absolute precondition fornormal production operation. During the processing of fibers to formyarn, a relative humidity is to be maintained in a narrow band widthrange of 40% rH to 50% rH, whereas the processing of yarns to formfabrics and knitted products requires a rather higher air humidity of60% rH to 80% rH. However, condensation must never occur, and on theother hand the air humidity is also not to fall below 30% rH, even for abrief period. Since as is known the relative humidity and thetemperature are related to each other according to the so-called Mollierdiagram, it is moreover necessary for the temperature of the air in theroom likewise to be controlled within a narrow band width by the airconditioning system. The highest requirements on the air conditioningare placed by the combination of modern ring spinning machines andspooling machines. The two machines are set up directly alongside eachother in the spinning room, but require different air conditioning. Thering spinning machine is particularly sensitive to the relative humidityof the air: an air humidity of more than 50% rH leads to the formationof fiber laps on the drafting mechanism cylinders and top rollers of thedrafting mechanism. On the other hand, too dry an environment promotesthe formation of fiber lint, which can cause disturbances at variouslocations on the ring spinning machine. For its part, the spoolingmachine prefers a compliant yarn with a low tendency to snarling, andhence a rather moist climate. In the case of this machine, it is a caseof preventing the shifting of fibers along the filament and productionof filament loops and snarls, which can lead to disturbances in thespooling machine.

The combination of ring spinning machine and spooling machine alsoplaces high requirements on the air conditioning in relation to theloading on the air. The ring spinning machine, with its open spinningpoints, continuously emits fibers to the environment. In order toprotect the health of the operating personnel, the ambient air musttherefore be exchanged frequently. In addition, both machines dissipatea considerable power loss to the environment, with the result that theair in the spinning room must be fundamentally cooled by the airconditioning system, be it by means of moistening or additionally bymeans of cooling units.

With the introduction of high-capacity ring spinning machines, whichhave over 1000 spindles and spindle speeds of 20,000 revolutions/minuteand more, more than 25 air changes per hour are necessary under theconditions mentioned. The existing air conditioning systems are as aresult loaded to their limits. Investigations have in particular shown,for example in the dissertation "Energiesparmassnahmen in einervollinformatisierten Baumwollspinnerei" Energy-saving measures in afully automated cotton spinning mill!, published at the beginning of1994 by Rolf Friedrich Bergrath at the Technical University of Zurich(Diss.ETH-No. 10657), that the control loops are only capable offollowing rapid changes in the air circuits to an unsatisfactory extent.This leads to uncontrollable oscillations and swings in the temperatureand the relative humidity of the air in the room, which within minutescan cause a large number of thread breakages or laps on the spinningmachines, so that under certain circumstances the latter even have to beswitched off.

The present invention is therefore based on the object of offering adevice for air-conditioning control in an air-conditioned room havingtextile machines, in particular ring spinning and spooling machines,which device ensures stable and accurate control of the temperature andof the relative humidity of the air in the room under all operatingconditions.

The invention has the great advantage that, in a manner which isintrinsically and individually simple, but very effective, a stable andsufficiently precise control of the temperature and of the relativehumidity in the air-conditioned room is achieved. The solution accordingto the invention may therefore readily be used in existing airconditioning systems, so that replacement by a new air conditioningsystem is not necessary. Furthermore, the device according to theinvention allows the necessary power to be treated very economically,since the throughputs of air can be reduced to the absolutely necessaryminimum.

Further advantages of the invention follow from the dependent claims andfrom the following description. There, the invention is explained inmore detail using the examples illustrated in the schematic drawings, inwhich:

FIG. 1 shows a schematic illustration of the air conditioning system foran air-conditioned room of a textile operation,

FIG. 2 shows a basic illustration to illustrate the control concept ofthe air conditioning system,

FIG. 3 shows a block diagram of a first embodiment of theair-conditioning control,

FIG. 4 shows a block diagram of a second embodiment of theair-conditioning control,

FIG. 5 shows a detailed illustration of the mixing unit, and

FIGS. 6a-6d show examples of fuzzy sets for controlling the airconditioning system.

In the figures, in each case the identical reference symbols are usedfor the same elements, so that first-time explanations relating to theseelements apply to all the figures.

FIG. 1 shows the basic structure of the air-conditioning controlaccording to the invention in an air-conditioned room 1 having aplurality of ring spinning machines 2 in combination with spoolingmachines 3. The waste heat which is radiated into the room 1 as a resultof the power loss of the spinning and spooling machines 2 and 3 isindicated with arrows 4. The air-conditioned room 1 is supplied withfreshly air-conditioned supply air via an air supply duct 5, anddischarge air contaminated with lint and dust is removed on the one handvia an air discharge duct 6 and on the other hand via a machine airdischarge duct 7, which is connected to suction units and migratorycleaners, which are not shown further here. The air discharge duct 6 andthe machine air discharge duct 7 are led together via a filter unit 8,comprising an upstream and a downstream filter, and a subsequent blower9, and are connected via a connecting duct 10 to a mixing unit 11, whichis constructed as a recirculation air valve and is motor-adjustable (forcloser details, cf. FIG. 5). The mixing unit 11 has a blow-out duct 12and an external air duct 13, with which on the one hand the contaminateddischarge air and water vapor can be removed from the circulation and onthe other hand fresh external air can be sucked in. The mixing unit 11is then connected via a mixed air duct 14 to an air conditioning system16. The air conditioning system 16 has a cooling unit 17 with anadjustable valve 18, an air scrubber 19 with a variable-speed pump 20, aheater 22 and a blower 23, which are connected to one another in thesequence listed. The various connecting ducts between these elements areidentified using double lines and arrows. The waste heat dissipated bythe cooling unit 17 is indicated by an arrow 24. The blower 23 isconnected to the air supply duct 5 as the last element of the airconditioning system 16. The signal connections between a processcomputer 26 and sensors 27 on the air supply duct 5 and sensors 28 onthe air discharge duct 6 are indicated by dashed lines. The electricalcontrol lines to the blower 8, and to the mixing unit 11 and to thecontrol elements of the air conditioning system 16 are identified bydashed lines. Likewise indicated by dashed lines is the fact thatsensors 29 can be provided on the external air duct 13. The sensors 27,28 and 29 serve for measuring the temperature and the relative humidity.At least the temperature sensor for the supply air has a semiconductorresistor (also called an NTC resistor) or a resistance wire (made ofso-called Pt100) of low mass, and thus has a rapid reaction time of afew seconds. Moisture sensors of the capacitive or resistive type have asufficiently small. time constant in order to be able to register rapidchanges in the supply air, for which reason these are preferred here. Avery rapid reaction time is not absolutely necessary for the sensors 28in the air discharge duct 6, so that slower sensors can logically beemployed there. The process computer 26 essentially has a first controlloop 31, designated as room air controller, and a second control loop32, designated as supply air controller, whose function will bedescribed in more detail with reference to FIGS. 2 to 4.

The control concept of the air conditioning system 16 will now bepresented in more detail in conjunction with FIG. 2. The room aircontroller 31 is connected on the one hand to the supply air controller32 and on the other hand to a first controlled system 33 for theair-conditioned room 1. The supply air controller 32 is moreoverconnected to a second controlled system 34 for the air conditioningsystem 16 and to the first controlled system 33. The room air controller31, the supply air controller 32, the first and the second controlledsystems 33 and 34 can be operated in a known way, pneumatically,hydraulically or else electrically. Using the desired values of the airin the room, indicated by the arrow R-Soll, and the measured values ofthe temperature and of the relative humidity of the air in the room,indicated by the arrow R-Ist, the room air controller 31 determines theset points Z-Soll for the temperature and the relative humidity of thesupply air. These set points Z-Soll, together with the measured valuesZ-Ist of the temperature and of the relative S humidity of the supplyair and, if appropriate, with the measured values of the temperature andof the relative humidity of the external air, are applied to the supplyair controller 32. From these values Z-Soll and Z-Ist, the supply aircontroller 32 determines the values to be set for the controlledvariables of the air conditioning system 16, which act on the variousinfluence factors such as cooling unit 17, air scrubber 19, heater 22and blower 23. These define, together with the sensors 27 on the airsupply duct 5 and if appropriate with the sensors 29 on the external airduct 13 (cf. FIG. 1), the controlled system 34 of the air conditioningsystem 16. As a result of this control, a stable state of the supply airis quickly established, said air being introduced into theair-conditioned room 1 and mixing there with the room air which ispresent. The result of this mixing is a new state of the air in theroom, as regards temperature and relative humidity, which are registeredby the sensors 28. From this, the room air controller 31 then determinesin the manner explained above the new set points Z-Soll of thetemperature and of the relative humidity for the supply air. In thiscascade control, the supply air controller 32 ensures the stability andthe room air controller 31 the accuracy of the values to be set.

A concrete design for the cascade control described above is nowspecified in FIG. 3. The physical relationship of relative humidity andtemperature is of little advantage in terms of control technology, sincethey mutually influence each other. Given a constant absolute watercontent of the air, in the case of a temperature change the relativehumidity is also changed, and vice versa. If, for example, the relativehumidity of the supply air is to be increased and the temperature to bekept the same, then the control elements of the pump 20 of the airscrubber 19 and those of the valve 18 of the cooling unit 17 have to becontrolled simultaneously. If more water is sprayed in by increasing thepump rotational speed, then the relative humidity increases, and thetemperature of the moistened air falls because of the heat ofevaporation extracted from it. Consequently, the valve 18 must in turnbe closed more in order to balance out this temperature difference. Forthis reason, two separate cascade controllers are provided for thetemperature and the relative humidity, both being constructedidentically and therefore able to be explained using a single FIG. 3.The control will now be presented in relation to the temperature of thesupply air, but is consequently designed identically for the control ofthe relative humidity. In a difference element 36, the difference isformed between the desired value R-Soll of the room air temperature andthe actual value R-Ist of the room air temperature, which signal isforwarded to an amplifier 37 having the gain factor K_(R) for the roomair. From this, a time integral is formed in an integral element 38, andthis signal is fed to a difference element 39 as the set point Z-Sollfor the supply air temperature. Here, a difference is formed from theset point Z-Soll and the actual value Z-Ist, which signal is forwardedto an amplifier 40 with the gain factor K_(Z). This signal is connectedvia an integral element 41 to the above-described controlled system 34of the air conditioning system 16, in which the current actual valueZ-Ist, that is to say the current temperature of the supply air, isformed and measured. The supply air which is introduced into theair-conditioned room 1 influences the room air temperature, which isindicated using a signal line 44 and the controlled system 33 of theair-conditioned room. There, the new actual value R-Ist of the room airtemperature is measured in the manner described above. Cascade controlfor the relative humidity is also provided in precisely the same way.

The first cascade controller then controls the relative humidity via thepump 20 of the air scrubber 19 (FIG. 1). At each correction of therelative humidity, a change to the temperature takes placesimultaneously, which is not desired under certain circumstances. Thesecond cascade controller for the temperature then controls thetemperature via the valve 18 of the cooling unit 17. At each control ofthe temperature, a change also takes place in the relative humidity. If,then, both cascade controllers run simultaneously, each cascadecontroller corrects its own controlled variable with the disturbanceswhich are caused to its controlled variable by the other cascadecontroller. This results in the variables of the supply air to becontrolled levelling out, with the result that the temperature and therelative humidity of the room air in the air-conditioned room 1 are keptconstant at a very stable value.

In the case of the control previously described, the values of thesupply air oscillate with a very low amplitude about a base value, whichis a consequence of the integral elements of the cascade controllersinteracting with the sensors. In order to improve this, the abovecircuit can be supplemented, as shown in FIG. 4, using proportionalelements. A proportional element 46 having the proportional coefficientPR is connected via a summing element 47 in between the differenceelement 36 and the difference element 39, parallel to the amplifier 37and integral element 38. Similarly, a proportional element 49 having theproportional coefficient PZ and a summing element 50 is connected inparallel with the amplifier 40 and integral element 41. The cascadecontroller equipped in this way reacts more rapidly, so that when thespinning and spooling machines 2 and 3 are started up, the relativehumidity of the air in the room reaches the prescribed desired value asrapidly as possible. As a result, thread breaks in the starting phaseand also during doffing are prevented to the greatest possible extent.The oscillations of the temperature and of the relative humidity of thesupply air, which can still occur in the case of the cascade controldescribed in FIG. 3, no longer occur in the case of this cascadecontrol.

The cascade controllers described in FIGS. 3 and 4 are suitable both foran air conditioning system in pure recirculation operation, that is tosay in which no fresh air is added from outside the air-conditioned room1, and with the exchange of discharge air laden with water vapor andfreshly supplied external air. The mixing unit or recirculation airvalve 11 is shown in more detail in FIG. 5 in order to explain thisprinciple. As can be seen there, the discharge air 51 is introduced viathe connecting duct 10 into the mixing unit or recirculation air valve11. The mixing unit 11 is divided into two chambers 57 and 58 by amotor-adjustable series of louvers 56 lying alongside one another. Theconnecting duct 10 and the blow-out duct 12 are thus connected to thefirst chamber 57, and the external air duct 13 and the mixed air duct 14are connected to the second chamber 58. Inside the mixing unit 11, rowsof louvers 59 and 60, likewise motor-adjustable, are provided upstreamof the blow-out duct 12 and upstream of the external air duct 13. Theair conditioning system 16 can thus be operated exclusively withrecirculated air (louvers 56 completely open; louvers 59 and 60completely closed), or all the discharge air 51 is expelled as blow-outair 52 and is exchanged for fresh external air 53 (louvers 56 completelyclosed, louvers 59 and 60 completely open). Between these two endpositions, by means of suitable setting of the opening angle of thelouvers 56, 59 and 60, the discharge air 51 can be mixed with freshexternal air 53 in a predetermined ratio and fed as mixed air 54 to theair conditioning system via the mixed air duct 14.

The mode of operation of the air conditioning controller which isoperated in this manner and is shown in FIG. 1 in conjunction with FIG.5 is now as follows:

If the waste heat 4 from the spinning machines 2 and the spoolingmachines 3 is not sufficient to heat up the supply air to the correcttemperature, the heater 22 must be switched on. This is true, forexample, for spinning mills in relatively cold areas, such as innorthern Europe. In this case, the recirculation air valve 11 isswitched to recirculated air, that is to say no fresh external air 53 issupplied via the external air duct 13. The recirculation air valve 11 ishowever, switched into another position when the temperature of thesupply air is intended to be cooled by means of the supply of externalair, which may apply to spinning mills in relatively warm areas. In thiscase, the discharge air 51 is mixed with the fresh external air 53, sothat the supply air is automatically cooled. This takes place under theprecondition that the external air 53 is cooler than the discharge air51. Only if this type of cooling is not sufficient, that is to say ifthe louvers 56, 59 and 60 of the recirculation air valve 11 are in theirend position, that is to say when complete exchange of discharge air 51for fresh external air 53 is taking place, is the control element of thevalve 18 of the cooling unit 17 driven. In this way, it is intended tocontrol not only the temperature of the supply air but also the relativehumidity.

It goes without saying that the prescriptions on the air conditioningsystem 16 are not always unique, because of the requirements indicatedabove, and can even mutually oppose one another. In order neverthelessto achieve sensible control, control using so-called "fuzzy logic" issuggested, the fundamentals of which are extensively presented in thetext book "Fuzzy-Logik" by Prof. Dr. Gert Bohme in the Springer-Verlag(1993). In this case, in order to make a decision, specific fuzzy setsare used which permit less precise statements to be converted intostable control of the manipulated variables.

The use of fuzzy logic for the control described above is nowillustrated in part using FIGS. 6a-6d. Shown in FIG. 6a is a fuzzy setfor the set point of the temperature T-Soll as a function of theexternal temperature T_(A). The set point T-Soll must not fall below aspecific minimum value T-Soll_(min), which is reached at an externaltemperature T_(Amin). Likewise, set point T-Soll must not go beyond aspecific maximum value T-Soll_(max), which is reached at an externaltemperature T_(Amax). Between these two values, the set point T-Sollchanges linearly with the external temperature T_(A). This means thatthe control of the set point T-Soll in this range follows the externaltemperature T_(A). Below the minimum value T-Soll_(min), the temperaturecan additionally be maintained by means of the heater 22, and above themaximum value T-Soll_(max) by means of the cooling unit 17. In orderthat the adaptation of the set point T-Soll is not carried out directlyfollowing each change of the external temperature T_(A), a timelimitation is provided in accordance with the curve of FIG. 6b, whichprovides for a slow setting of the set point in which the set point,beginning from a time t₁, is reached after a time period t₂ -t₁. Usingsuch control, a sliding temperature setting is possible, which resultsin optimum utilization of the cooling or heating of the supply air bymeans of fresh external air. This avoids rapid temperature changes,which cannot be transmitted to the machines with their thermal inertia,which for the first time makes an economical sliding management oftemperature possible. The setting of the above-mentioned desired curveis carried out by the spinning mill manager, who can thus employ hisrelevant experience in a targeted manner in the control of the airconditioning system 16.

The fuzzy set for setting the control elements SG of the cooling unit 17and of the heater 22 as a function of a manipulated variable S, given bythe actual value of the temperature T-Ist and the set point T-Soll, isnow shown in FIG. 6c. If this manipulated variable S falls below aspecific value S_(min), the heater 22 is gradually switched on inaccordance with the curve 62. Conversely, if the manipulated variable Sgoes above a specific value S_(max), the cooling unit 17 is switched onin accordance with the curve 63. Within the range between S_(min) andS_(max), the temperature of the supply air is controlled only by meansof the recirculation valve 11. The linear control of themotor-adjustable louvers 56 is specified according to the curve 64,shown dashed in FIG. 6d, and that of the louvers 59 and 60 according tothe curve 65, shown with continuous lines in FIG. 6d. Using these fuzzysets, the air conditioning system 16 can be operated in an optimumfashion as a function of the circumstances, which is not possible withconventional air-conditioning control.

The air flow of the supply air and of the discharge air can also betaken into account, if the air discharge duct 6 is equipped with asensor for measuring the air flow velocity, in addition to the sensors28 (cf. FIG. 1). Using this, the capacity of the blower 23 can be set tothe absolute minimum necessary in order to ensure the required airexchange. As is known, in the case of too low a throughput of air in theair-conditioned room 1, the air in the room is too severely heated bythe waste heat from the textile machines in their direct vicinity, sothat locally considerable differences can be produced in the temperatureand in the relative air humidity, which have a negative effect on theoperation of the textile machines. Using this sensor, the air flow inthe air-conditioned room 1 can be registered via the discharge air, andthus the various manipulated variables of the air conditioning system 16can be Set in an optimum fashion by the control in accordance with afurther fuzzy set (not shown here), using the process computer 26.Furthermore, reverse flow of the machine discharge air into theair-conditioned room 1 via the air discharge duct 6 can be prevented.

Furthermore, a maximum value of dust and lint loading of the air in theroom must not be exceeded, on the basis of health regulations. Thesensors 28 in FIG. 1 can therefore also be supplemented with a sensorfor measuring the dust content, which are used for controlling theminimum throughput of air on the basis of the measured dust loading ofthe air in the room. Such a commercially-available sensor is based, forexample, on the principle of a laser light barrier, and can additionallyallow the filter capacity of the filter unit 16 to be controlled andmonitored via the process computer 26. The signal lines to the processcomputer 26 are in this case designed identically as for the sensors 28for the temperature and for the relative humidity. The control is thendesigned in such a way that the rotational speed of the fan of theblower 9 between the filter unit 8 and the recirculation valve 11 iscontrolled by the process computer on the basis of the value of the dustcontent measured in the air discharge duct 6.

As a further supplement, a differential pressure sensor 70 can beprovided in the air-conditioned room 1 (cf. FIG. 1), which sensorregisters the difference between the pressure in the air-conditionedroom 1 and the external pressure. An air flow sensor is preferably usedas the differential pressure sensor 70. The signal lines are once moreidentically designed and are connected to the process computer 26 as inthe case of the sensors 28. The rotational speed of the fan in theblower 23 is then changed, using a so-called "master/slave" controlloop, in proportion to the rotational speed of the blower 9, to bespecific in such a way that the pressure in the air-conditioned room 1is kept equal to the external pressure. This avoids the situation that,when doors are opened to the outside, an air balance flow is produced,which disturbs the overall functioning of the air conditioning system16. Instead of the above mentioned rotational speed control, the controlof the blower capacity can also be carried out via a throttling valvewhich is adjusted at constant rotational speed.

In a further embodiment, sensors 72 can also be provided for measuringthe electrical power or effective power consumed by all the textilemachines 2 and 3 located in the air-conditioned room 1 (cf. FIG. 1),said sensors, as in the case of the differential pressure sensor 70, arelikewise connected via signal lines to the process computer 26, andwhose measured signals have an influence on the control of the airconditioning system 16 in the manner described above. If appropriate,this can also already take place using a single common sensor 72 in theelectrical feed to all the textile machines 2 and 3. These commerciallyavailable sensors 72 for measuring the electrical effective powerfunction on the basis of a watt-metric measurement. The dust contentand/or the differential pressure and/or the electrical power consumedcan also be taken into account in the process computer 26 forcontrolling the air conditioning system 16, in accordance with arespective predetermined fuzzy set.

It is obvious for those skilled in control technology that, although thecontrol described above in the process computer 26, using a cascadecircuit of room air controller 31 and supply air controller 32, is veryadvantageous for stable control, it is also possible to use controlwithout cascade control using processors which operate only on the basisof the fundamentals of the fuzzy logic mentioned above. In such a case,the sensors 27, 28 and if appropriate 29 can be fed directly to aprocess computer 26 operating in this manner. The sensors 27, 28 and ifappropriate 29 then exert their influence on the manipulated variablesvia the usual means of fuzzy control. The usual means are integration,amplification, differentiation over time, allocation function over time(fuzzy set) and the like.

The device described above for air-conditioning control, in the variousembodiments, is very well suited for use in existing air conditioningsystems, that is to say it essentially needs only to have the sensors 27and 28 (and if appropriate the sensors 29, 70 and 72) installed at thecorrect location and the normal process controller exchanged for the newprocess computer 26 having the cascade controls. As a result, thisdevice saves a considerable ventilation capacity of the blower 23, whichis directly reflected in the production costs of a spinning mill.Furthermore, room air-conditioning having a reduced air flow and optimumsetting of the temperature and of the relative humidity furnishes animproved capacity of the textile machines with significantly less threadbreaks, above all in the starting and doffing phases. The improvedoperating climate likewise has an effect on the operating personnel,which can contribute to a further improvement in quality of the yarnproducts.

I claim:
 1. A device for high-dynamic air-conditioning control oftemperature and relative humidity in an air-conditioned room (1) havingtextile machines, comprising:(a) an air discharge duct (6) and an airsupply duct (5) which connect the air-conditioned room (1) to an airconditioning system (16); (b) a regulating device (26) including a firstset of sensors (28) for measuring the actual value of the roomtemperature and the relative humidity of the room air (R-Ist), whichsensors are operatively connected to at least one control loop of theair conditioning system (16), wherein the first set of sensors (28) isin controlling communication with a first control loop (31); (c) asecond set of sensors (27) for measuring the actual value of thetemperature and relative humidity of the supply air (Z-Ist) in the airsupply duct (5), wherein the second set of sensors (27) is incontrolling communication with a second control loop (32); (d) the firstcontrol loop (31) and the second control loop (32) being connected incascade, wherein the first control loop (31) delivers a desired valuefor the supply air (Z-Soll) to the second control loop (32) on a basisof the actual value of the room air (R-Ist) and a predetermined desiredvalue of the room air (R-Soll), and wherein the second control loop (32)delivers a control variable for controlling air-conditioning elements(17, 18, 19, 20, 22) operable for adjusting the temperature and relativehumidity of the air-conditioned room (1) on a basis of the desired valuefor the supply air (Z-Soll) and the actual value of the temperature andthe relative humidity of the supply air (Z-Ist).
 2. The device asclaimed in claim 1, wherein the first and second sets of sensors (28,27) for measuring the temperature are connected to a first cascadecontrol means, and the first and second sets of sensors (28, 27) formeasuring the relative humidity connected to a second cascade controlmeans, the first and the second cascade control means being operativelyindependent of each other.
 3. The device as claimed in claim 1 or 2,wherein the air discharge duct (6) includes a mixing unit (11)comprising a motor-adjustable recirculation air valve connected to anexternal air duct (13) on which sensors (29) for measuring thetemperature and the relative humidity are arranged, said sensors (29)and said mixing unit (11) connected for control purposes to the secondcontrol loop (32).
 4. The device as claimed in claim 1, wherein thecontrol loops (31, 32) are constructed as integral controllers.
 5. Thedevice as claimed in claim 1, wherein the control loops (31, 32) areconstructed as proportional "+" integral controllers.
 6. The device asclaimed claim 1, wherein the sensors (27) for measuring the temperatureand the relative humidity of the air in the room are positioned in theair discharge duct (6) of the air-conditioned room (1).
 7. The device asclaimed in claim 1, wherein the sensors (27, 28, 29) for measuring thetemperature are sensors having resistor means selected from a groupconsisting of a semiconductor resistor and a resistance wire.
 8. Thedevice as claimed claim 1, wherein the sensors (27, 28, 29) formeasuring the relative humidity include measurement means selected fromthe group consisting of capacitor means or resistor measurement means.9. The device as claimed in claim 1, wherein an air flow velocity sensoris provided for measuring the air flow velocity in the air dischargeduct (6) of the air-conditioned room (1), said air flow sensor beingconnected to a rotational speed control means of a blower (23) in orderto control the throughput of air.
 10. The device as claimed in claim 9,wherein a dust content sensor is provided for measuring the dust contentin the air discharge duct (6) of the air-conditioned room (1), themeasured values of said dust content sensor being intended to prescribea minimum value for the throughput of air.
 11. The device as claimed inclaim 1, wherein there is provided in the air-conditioned room (1) adifferential pressure sensor (70) which is connected to a control meansof at least two blowers (9, 23) in order to control the pressurebalance.
 12. The device as claimed in claim 1, characterized in that inthe electrical feed to the textile machines (2, 3) in theair-conditioned room (1) there is provided at least one powerconsumption sensor (72) for registering the electrical power consumed,said sensor being connected to a process computer (26).
 13. The deviceas claimed in claim 1, wherein the control loops (31, 32) operate inaccordance with predetermined fuzzy sets for the temperature, for therelative humidity and if appropriate for the throughput of air and/orthe differential pressure and/or the electrical power consumed.
 14. Adevice for high-dynamic air-conditioning control of temperature andrelative humidity in an air-conditioned room (1) having textilemachines, comprising:(a) an air discharge duct (6) and an air supplyduct (5) which connect the air-conditioned room (1) to an airconditioning system (16); (b) sensors for measuring the temperature andthe relative humidity of the air, which sensors are operativelyconnected to at least one control loop of the air conditioning system(16), wherein the sensors are connected for control purposes to aprocess computer (26) which has at least one control loop (31, 32),operating in accordance with predetermined fuzzy sets, and operativelyconnected to air-conditioning control elements for control oftemperature and relative humidity; and (c) at least one of said sensorscommunicating with said air supply duct (5) downstream of said controlelements for measuring the temperature and the relative humidity of airsupplied to the air conditioned room (1), and said at least one sensorcommunicating these measured values to said at least one control loop(31, 32), wherein said at least one control loop (31, 32) directs saidcontrol elements to accurately maintain the temperature and the relativehumidity of the air-conditioned room (1) within a narrow bandwidth. 15.The device as claimed in claim 14, wherein a dust content sensor isprovided for measuring the dust content in the air discharge duct (6),said dust content sensor being connected for control purposes to theprocess computer (26), which has at least one control loop (31, 32),operating in accordance with a predetermined fuzzy set, for thethroughput of air.
 16. The device as claimed in claim 14 or 15, whereina differential pressure sensor (70) is provided for measuring thedifferential pressure in the air-conditioned room (1), said differentialpressure sensor being connected for control purposes to the processcomputer (26), which has at least one control loop (31, 32), operatingin accordance with a predetermined fuzzy set for controllingdifferential pressure.
 17. The device as claimed in claim 14, wherein atleast one power consumption sensor (72) is provided for measuring theelectrical power consumed by the textile machines (2, 3), said powerconsumption sensor being connected for control purposes to the processcomputer (26), which has at least one control loop (31, 32), operatingin accordance with a predetermined fuzzy set, for the electrical powerconsumed.
 18. A method for high-dynamic air-conditioning control oftemperature and relative humidity in an air-conditioned room (1) havingtextile machines, comprising the steps of:(a) directing the dischargeair into an air-conditioning system (16) wherein the air isreconditioned and fed as supply air to the air-conditioned room (1); (b)measuring the temperature and the relative humidity of the air in theroom; (c) inputting these values to a first control loop (31), in whicha set point for the temperature and a set point for the relativehumidity of the supply air are determined on the basis of prescribeddesired values; (d) inputting said temperature and relative humidity setpoints together with measured values for the temperature and for therelative humidity of the supply air to a second control loop (32), onthe basis of which the control elements of the air conditioning system(16) are set, the temperature and relative humidity of the supply airbeing measured downstream of the control elements, such that thetemperature and relative humidity of the air conditioned room (1) areaccurately maintained within a narrow bandwidth.
 19. The method asclaimed in claim 18, wherein the control elements of the airconditioning system (16) relating to the temperature and relativehumidity are set via separate controllers.
 20. The method as claimed inclaim 18, and including the step of controlling the air flow velocity ofthe discharge air from the air-conditioned room (1) and the throughputof air in the air conditioning system (16) is controlled on the basis ofmeasured values of the air flow velocity and throughput of air in theair conditioning system.
 21. The method as claimed in claim 18,including the step of measuring the dust content of the discharge airfrom the air-conditioned room (1) and defining a minimum value for thecontrol of the throughput of air on the basis of the measured value ofthe dust content.
 22. The method as claimed in claim 18, and includingthe step of measuring the differential pressure between the pressure inthe air-conditioned room (1) and the external pressure, and controllingthe air flow in the air conditioning system (16) by means of blowers (9,23) in such a way that the pressure in the air-conditioned room (1) iskept equal to the external pressure.
 23. The method as claimed in claim18, and including the step of measuring the electrical power consumed bythe textile machines (2, 3) in the air-conditioned room (1) andcontrolling the temperature, relative humidity and the throughput of airin the air-conditioned room (1) on the basis of these measured values.24. The method as claimed in claim 18, wherein the temperature, therelative humidity and if appropriate the throughput of air arecontrolled on the basis of predetermined fuzzy sets.
 25. A method forhigh-dynamic air-conditioning control of temperature and relativehumidity in an air-conditioned room (1) having textile machines,comprising the steps of:(a) directing discharge air into an airconditioning system (16), reconditioning the air in the air conditioningsystem and feeding supply air to the air-conditioned room (1), whereinthe temperature and the relative humidity of the air in the room aremeasured, and these values communicated to a process computer (26)operatively connected to air-conditioning control elements; and (b)measuring the temperature and the relative humidity of the supply airdownstream of the control elements and communicating these measuredvalues to the process computer, wherein the air conditioning system (16)is controlled on the basis of predetermined fuzzy sets for thetemperature and the relative humidity, such that the temperature and therelative humidity of the air conditioned room (1) are accuratelymaintained within a narrow bandwidth.
 26. The method as claimed in claim25, and including the step of measuring the air flow velocity of thedischarge air from the air-conditioned room (1) and controlling thethroughput of air in the air conditioning system (16) on the basis ofthese measured values, in accordance with a predetermined fuzzy set. 27.The method as claimed in claim 25, and including the step of measuringthe differential pressure between the pressure in the air-conditionedroom (1) and the external pressure and controlling the air flow in theair conditioning system (16) by means of blowers (9; 23), in accordancewith a predetermined fuzzy set, in such a way that the pressure in theair-conditioned room (1) is kept equal to the external pressure.
 28. Themethod as claimed in claim 25, and including the steps of measuring thedust content of the discharge air from the air-conditioned room (1),defining a minimum value for the throughput of air on the basis of thesemeasured values, and controlling the throughput of air on the basis ofthis minimum value in accordance with a predetermined fuzzy set.
 29. Themethod as claimed in claim 25, and including the step of measuring theelectrical power consumed by the textile machines (2, 3) in theair-conditioned room (1) and controlling the temperature, the relativehumidity and the throughput of air in the air-conditioned room (1) onthe basis of these measured values in accordance with a predeterminedfuzzy set.